Chusetts



Patented Sept. 12, 1922.

PHIL IPEE DE CLAMEQY, 013 BOSTON, MASSACHUSETTS, ASSIGNOR TO B. F. STURTE- VANT COMPANY, OF HYDE PARK, MASSACHUSETTS, A CORPORATION OF MASSA- CI-IUSETTS.

STEEL AND IRON ALLOY.

We Drawing.

To all whom it may concern:

Be it known that I, PHILIPPE DE CLAMEoY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Steel and Iron Alloys; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to steel and iron alloys. I

The object of the invention is to provide steel and iron alloys which not only have the usual characteristics ada ting them to the various commercial uses for which they are intended but also are non-corrosive and non-rusting under conditions which render the use of the usual commercial irons and steels impracticable or which result in their rapid deterioration or destruction.

I have found that by the addition to commercial pig irons or steels of small percent ages of cobalt, nickel, chromium and silicon,

alloys may be produced which are not acted on or attacked by gaseous fumes or vapors of sulphur or solutions of sulphuric acid and are not oxidized when subjected to the usual oxidizing atmospheres. The proportions which I have found to give highly satisfactory results are' 2%% cobalt, 2% nickel, 1%-% chromium and 14 silicon. These proportions may be variedsomewhat but should not be increased sufficiently to rcnderthe resulting alloy unfit for commerclal use or reduced sufiiciently to seriously impare its non-corroding and non-rusting qualities. For instance, I have found that an increase of the cobalt and chromium above 6')" and of the nickel and silicon above 71 and 3% respectively renders the resulting alloy too brittle for commercial use,

although it is still non-corrosive and its 45 rust resisting qualities are increased. on

the other hand the reduction in the percentages to cobalt 11%, nickel il /J, chromium Application filed October 6, 1919. Serial No. 328,685.

to, the percentage of such element present should of course be allowed for in the production of the alloy. The alloys may be produced by adding the elements referrer: m to pig iron or steel already manufactmed or may be incorporated in the original manufacture.

By the inclusion of the elements referred to in approximately the proportions mentioned, iron and steel may be produced which is not materially affected by the action of the corrosive fumes and vapors of sulphur and of any solution of sulphuric acid and by the oxidizing and rusting action of moisture and air whi e retaining the tensile strength, malleability and other characteristics which render it particularly adapted for the commercial use for which it may be intended. These alloys may therefore be used with particular advantage in the manufacture of apparatus, such for instance as economizers and blowers, for use under conditions in which it handles or is subjected to the action of corrosive or oxidizing gases, fumes, or vapors. This alloy also has the further advantage that it may be easily annealed to contain not more than .9% carbon and then allowed to quench in the atmosphere thereby giving a good temper to the annealed alloy.

What is claimed is:

1. An alloy of iron or steel, containing over 11 and less than 6% of cobalt, over 1 and less than (3% of chromium, over 2% and less than 13% of nickel, and over T}% and less than 3% of silicon.

2. An alloy of iron or steel, containing approximately 25% cobalt, 2% nickel, 1%70 chromium, and 11}% silicon.

PHILIPPE on CLAMECY. 

